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The Minnesota Star Tribune encourages a diversity of voices in our letters. Learn how to submit a letter and about our selection process.

What is a star? A star is any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources. Of the tens of billions of trillions of stars in the observable universe, only a very small percentage are visible to the naked eye.

A star’s gas provides its fuel, and its mass determines how rapidly it runs through its supply, with lower-mass stars burning longer, dimmer, and cooler than very massive stars.

Star - Formation, Evolution, Lifecycle: Throughout the Milky Way Galaxy (and even near the Sun itself), astronomers have discovered stars that are well evolved or even approaching extinction, or both, as well as occasional stars that must be very young or still in the process of formation.

ENERGY STAR® is the simple choice for energy efficiency. For more than 20 years, EPA’s ENERGY STAR program has been America’s resource for saving energy and protecting the environment.

How does a star work? How do they form, live, and eventually die? Learn more about these distant objects and their major importance in the universe.

Watch Star Free Online | 1 Season. Three talented singers—a pair of sisters who grew up in foster care and a wealthy New Yorker—navigate the ups and downs of the Atlanta music industry.